When your air compressor is wearing out. Even if its still good it will fill up ur tanks with oil and the dryer wil pit it out.
Most older trucks i see are always spraying air out.
By unloader you mean the dryer?
@SkateBoard you could try changing the governor thats only like 10 bucks and can be changed in 5 mins.
Or remove the top of the compressor n check the valves to know if they are working.
My peterbilt air compressor run on 1 piston for a week.
And the works...
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